Coronado SolarMax III 90mm f/8.8 Double-Stacked H-alpha Solar Telescope (30mm Blocking, OTA Only)

Coronado SolarMax III 90mm f/8.8 Double-Stacked H-alpha Solar Telescope (30mm Blocking, OTA Only)

Coronado SolarMax III 90mm f/8.8 Double-Stacked H-alpha Solar Telescope (30mm Blocking, OTA Only)

B&H # COSMIII90D30 MFR # 324014
New Item - Special Order

Product Highlights

  • 800mm f/8.8 Solar Viewing Refractor
  • For Prominence and Chromosphere Viewing
  • Easily Convert for Nighttime Use
  • Double-Stacked External H-Alpha Etalon
  • RichView and T-Max Etalon Tuning Systems
  • Large 30mm Rear Diagonal Blocking Filter
  • <0.5Å Hydrogen-Alpha Wavelength
  • 2-Speed 2" Rack-and-Pinion Focuser
  • Vixen-Style Dovetail Mounting Plate
  • Three Eyepieces, 2x Barlow, Solar Finder
Show moreShow less

Filter Options: Double-Stacked Etalon, 30mm Blocking

Double-Stacked Etalon, 10mm Blocking

Not available with current selections

Double-Stacked Etalon, 15mm Blocking

New Item - Special Order

Double-Stacked Etalon, 30mm Blocking Single External Etalon, 10mm Blocking

Not available with current selections

Single External Etalon, 15mm Blocking

New Item - Special Order

Single External Etalon, 30mm Blocking

Special Order

Single Internal Etalon, 10mm Blocking

Not available with current selections

Aperture: 90mm f/8.8

60mm f/6.6

Not available with current selections

70mm f/5.7

Not available with current selections

90mm f/8.8

B&H $500 Gift Card Dash

Share for a chance to win a $500 B&H Gift Card!

Share on Twitter

Share a favorite product for chances to win one of eight $500 B&H Gift Cards!
1 new winner announced every Monday starting Nov 5th!
Limit 1 entry per day: Come back every day to increase your chance of winning.

Be sure to mention #BHWishList when you share!

Congrats to our winners so far:

Next winner: Dec 17th

James Z. (Wk 1)

Ralph H. (Wk 2)

Arturo M. (Wk 3)

Rich P. (Wk 4)

Valeria A. (Wk 5)

Sabrina B. (Wk 6)

Official Rules


NO PURCHASE IS NECESSARY TO ENTER OR WIN. The B&H $500.00 Gift Card Dash (the "Sweepstakes") is void where prohibited by law and is sponsored by B&H Foto & Electronics Corp., 440 Ninth Avenue, New York, NY 10001 ("Sponsor"). It is not sponsored or endorsed by Facebook or Twitter in any way.

Entry Period/Methods of Entry. The Sweepstakes will run from on or about October 28, 2018 until on or about December 23, 2018 (the "Entry Period"). Entries received outside the Entry Period are void. Enter the Sweepstakes via either one of the following methods. (1) Share any product found on the B&H website (the "Website") on Facebook or Twitter via the dedicated links contained on the website using the hashtag #BHWishlist; or (2) Mail a postcard (postmarked during the Entry Period) containing your name, address, phone number, and email address, and indicate the subject(s), if any, about which you are interested in receiving future emails from B&H (e.g. photo, video, audio, computers, home theater, portable entertainment ) (optional) to: B&H $500.00 Gift Card Dash Sweepstakes, c/o B&H Foto & Electronics Corp., 440 Ninth Avenue, New York, NY 10001 (either option, an "Entry"). Entries must not, in the sole and absolute discretion of the Sponsor, contain obscene, provocative, defamatory, sexually explicit, or otherwise objectionable or inappropriate content. Entries deemed by Sponsor to be inappropriate will be disqualified. Entries owned by a third party, or the use of any trademarks, service marks, logos, brands, or products owned by a third party are not acceptable for entry into the Sweepstakes. Limit 1 entry per person, per day.

Winner Selection/Prizes/Odds. The B&H Social Team will randomly select a winner from among all eligible entries every Monday during the Entry Period, for a total eight (8) winners (each a "Winner"). Each Winner will receive a B&H Gift Card pre-valued in the amount of $500.00. No cash or other substitutions will be offered. Winner selection is in the sole and absolute discretion of the B&H Social Team. Any taxes are the sole responsibility of the winner. Winners will be notified and receive their prize at the email address associated with the account to which their Entry was posted or the email account provided with a mail-in entry. The odds of winning depend on the number of eligible entries received.

Identity of Winners/Eligible Participants. Winners will be identified by the email account associated with the Facebook or Twitter account from which their Entry was submitted or the email account provided with a mail-in entry. An email account holder shall mean the natural person assigned to such email account by the internet access or online service provider or other organization responsible for assigning email addresses for the domain associated with such email account. Any issues regarding the identity of a Winner shall be resolved by Sponsor in its sole discretion. The Sweepstakes is only open to residents of the United States that are at least eighteen (18) years of age on their entry date and is not open to employees of Sponsor, their immediate family, any person domiciled with such employees, or any affiliates or subsidiaries of Sponsor.

Entry Ownership/Entrant Agreements. Entrants retain full ownership and copyrights to their Submission. However, by entering the Sweepstakes entrants grant Sponsor permission to use their Entries for promotional purposes on their respective social media channels with proper credit. Entrants also agree: (a) to be bound by these Official B&H $500.00 Gift Card Dash Sweepstakes Rules; (b) that any claims related to this Sweepstakes shall be resolved individually without resort to any form of class action and that awards, shall be limited to actual out-of-pocket costs incurred in entering the Sweepstakes, and shall not include incidental or consequential damages or attorneys fees; and (c) that any actual or perceived ambiguities in these rules shall be interpreted by Sponsor in their sole discretion.

Limitation of Liability/Sponsor Modification/Cancellation Rights/ Choice of Law/ Venue/ Winners List. Sponsor is not responsible for incomplete entries or for failure to receive entries due to technical failures or human error of any kind. Winners agree that Sponsor will have no responsibility for losses or damage of any kind resulting from the acceptance, possession, or use of the prizes. Except where prohibited, participation in the Sweepstakes constitutes entrant's consent to the publication of his or her name by Sponsor in any media for commercial or promotional purposes without limitation or further compensation subject to Sponsor's respective Privacy Policies. Sponsor may modify or discontinue the Sweepstakes at any time and may disqualify from the Sweepstakes any person it determines, in its sole discretion, to have attempted to or actually tampered with or otherwise abused any aspect of the Sweepstakes. Entrants agree that in the unlikely event a dispute arises in connection with this Sweepstakes, it will be governed by the laws of the State of New York and heard exclusively in a court of applicable jurisdiction in the County and State of New York irrespective of any choice of law provisions to the contrary. To receive names of the winners by U.S. mail, please mail a self-addressed stamped envelope to: B&H Foto & Electronics Corp., Attn: B&H $500.00 Gift Card Dash Sweepstakes, 440 Ninth Avenue, New York, NY 10001. Any Winners List request must be received by B&H within one (1) year of the date the Sweepstakes is conducted.

Let us know how to reach you if you win!

Privacy 100% guaranteed; email address for contact purposes only


Already have a B&H account? Just log in tomorrow to enter again!

New Release!
$0 VA Sales Tax Collected on This Item
Add to Wish List Item in Wish List

Coronado SolarMax III 90mm overview

  • 1Description

Designed with dual external 90mm solar etalon filters, the Coronado SolarMax III 90mm f/8.8 Double-Stacked H-alpha Solar Telescope builds on the success of their earlier solar scope models to provide users with a powerful optic for solar and nighttime viewing. With the primary etalons positioned externally, users can simply and easily remove the front solar and rear blocking filters to convert the SolarMax III into a competent nighttime viewing telescope—greatly increasing the scope's versatility.

Its solar filter is specifically calibrated to isolate the hydrogen-alpha wavelength with a less than 0.5Å bandpass. The SM3's two etalons reduce the bandpass to refine the observation experience to see prominences in high contrast against the black backdrop of space, while revealing surface granulation and texture that broader bandpasses are unable to resolve. Each etalon has an independent tuning system that gives users the ability to precisely and easily bring them on band to improve contrast and enhance views when atmospheric interference or Doppler-shift cause the optical system to come off band. The primary etalon comes equipped with Coronado's rotating RichView tuning system, while the T-max tilt-tuner is employed on the secondary etalon. These two tuning methods ensure that interference between the two light paths is minimized, to further improve views.

The SolarMax III benefits from a precision 2" 7:1 dual-speed rack-and-pinion system. When used as a conventional scope, larger 2" conventional eyepieces and accessories can be used, though the more common 1.25" size is compatible when using the included 1.25" reducer adapter. The more precise focuser is complemented by a rear 90° 30mm blocking filter to provide a wide field of view and allows for full-disk viewing even with higher magnification eyepieces, or when photographing the sun, to fully cover larger imaging sensors. This secondary blocking filter is used to further isolate the H-alpha wavelength for improved contrast on surface granulation, and prominence detail. This larger blocking filter also enables the use of eyepieces with greater field-stop diameters to be used without vignetting occurring, as might occur with smaller-aperture blocking filters.

To get users started, Coronado includes a 2-to-1.25" reducer adapter and three CEMAX eyepieces that produce low, medium, and high powers, plus a 2x Barlow lens that doubles the magnification of each eyepiece. The eyepiece holder and blocking filter will accept any 2" solar eyepiece or accessory, and with the reducer adapter any 1.25" eyepiece can also be used. The optical tube assembly is offered here without a mount or tripod, but comes with a Vixen-style dovetail plate for users who already have a reliable and stable mount and support system. To protect the OTA and accessories during transport and storage, Coronado includes a hard carrying case with a custom-cut foam lining. The case is color-matched to the OTA in their elegant black and gold color scheme.

With the Coronado SolarMax III telescope you can enjoy stunning views of our closest star, and by simply removing the exterior solar filters you can view the moon, planets, and deep-sky objects at night.

Optical Tube Assembly
  • Use for daytime solar observation, or as a conventional nighttime scope with the solar and blocking filters removed
  • 90mm aperture improves contrast and solar details, and makes it ideal for lunar and planetary viewing, or to see bright deep-sky objects at night
  • Moderate f/8.8 focal ratio
  • Long 800mm focal length boosts magnification potential enabling higher powers to be used for more detailed views
  • Achromatic refractor-style lens configuration
  • Fully multi-coated optics improve light transmission, color rendition, contrast, and sharpness
  • 7:1 dual speed rack-and-pinion focuser allows for fast coarse and precise fine focusing to achieve tack-sharp images
  • 2" drawtube enables the use of larger eyepieces and accessories for full-disk viewing without vignetting
Solar Filter
  • Double-stacked 90mm aperture solar filter system reduces the bandpass for improved contrast and views
  • Fully external filters, etalons, and tuning systems allow filter to be completely removed
  • Tuned for viewing in the hydrogen-alpha wavelength, at 6562.8Å with a bandpass of less than 0.5Å
  • Reveals prominences in high contrast against the black backdrop of space
  • Observe surface granulation and texture with high contrast
  • Large 30mm secondary blocking filter improves contrast, and shows more space around the sun than smaller blocking filters to allow for higher magnification eyepieces to be used while maintaining full solar disk viewing and to completely cover large imaging sensor during solar photography; set in a 90° rear diagonal
  • Proprietary RichView tuning system on the primary etalon and the T-max tilt tuner on the secondary allow the etalons to be independently tuned for Doppler-shift compensation or to highlight specific zones without having the two tuned light paths interfere with each other
  • Optical tube assembly only—mount and tripod required for proper use
  • Mounting ring assembly allows the relative position of the OTA to the mount to be adjusted for proper balance and to limit obstruction with mount, counterweights, or other gear
  • Vixen-style dovetail plate available for use with conventional telescope mounts
  • Weight: 22 pounds
Included Accessories
CEMAX Eyepieces:
  • 1.25" diameter barrel
  • 25mm yields a low power of 32x
  • 18mm produces a medium magnification of 44x
  • High-power 12mm eyepiece produces 67x magnification
  • Fold-down rubber eyecup for use with or without eyewear
  • Designed specifically for use at H-alpha wavelengths to improve contrast and minimize glare
CEMAX Barlow Lens:
  • Specifically tuned to complement the eyepieces and rear blocking filter
  • Effectively doubles the magnification of any eyepiece used with it, without affecting eye relief, to make high-power viewing more comfortable
  • 1.25" nosepiece and holder
Sol Ranger Viewfinder:
  • Solar finder enables safe aiming of the OTA at the sun
Carrying Case:
  • Protects OTA and accessories during transport and storage
  • Hard aluminum exterior with reinforced corners and edges
  • Dual snap-lock latches with hinged handle
  • Custom-cut interior foam lining
  • Iconic Coronado black and gold coloring matches the optical tube assembly and accessories
  • Dimensions: 26.5x8.7x8.7"
UPC: 709942998412
In the Box
Coronado SolarMax III 90mm f/8.8 Double-Stacked H-alpha Solar Telescope (30mm Blocking, OTA Only)
  • 25mm CEMAX Eyepiece
  • CEMAX 18mm H-Alpha Solar Eyepiece (1.25")
  • CEMAX 12mm H-Alpha Solar Eyepiece (1.25")
  • CEMAX 2x Barlow Lens (1.25")
  • Sol Ranger Solar Viewfinder
  • 90° 30mm Blocking Filter
  • 1.25" Eyepiece Reducer Adapter
  • Cradle Ring Assembly with Dovetail
  • Hard Carrying Case
  • Limited 5-Year Warranty
  • Table of Contents
    • 1Description

    Coronado SolarMax III 90mm specs

    Optical Tube Assembly
    Aperture 90 mm / 3.5"
    Focal Length 800 mm
    Focal Ratio f/8.8
    Eyepiece Barrel Diameter 1.25", 2"
    Finderscope Yes
    Mounting System Vixen Style
    Filtration Wavelength Hydrogen-alpha
    Bandpass <0.5 Å
    Blocking Filter 30 mm (External)
    Assembled Dimensions 31.2 x 7.0 x 6.2" / 79.2 x 17.8 x 15.7 cm
    Weight 21.6 lb / 9.8 kg

    Coronado SolarMax III 90mm reviews

    Be the first to review this item

    Coronado SolarMax III 90mm Q&A

    Coronado SolarMax III 90mm accessories

    See any errors on this page? Let us know.